JPH11218240A - Ball valve - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When the fluid differential pressure is large or the bore is large, a large-output actuator is required to obtain a sufficient opening / closing operation torque, and the seat ring is worn or deteriorated. There were challenges. SOLUTION: A part of a primary fluid is branched, guided by an external introduction pipe 7, guided to a fluid introduction space H1 on the side opposite to the primary flow path, and a pressing force for pressing a ball plug 2 against a seat ring 6. Was offset. Therefore, for example, even when the fluid differential pressure or the diameter is large, the ball plug 2 can be reliably and smoothly provided without increasing the opening / closing operation torque.
Can be operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve connected to a pipe for opening and closing a fluid passage and adjusting a flow rate of a fluid.

[0002]

2. Description of the Related Art FIG. 10 is a longitudinal sectional view showing a conventional ball valve. In the figure, 101 is a fluid inlet 102.
A valve casing having an integral structure having an outlet 103 and an outlet 103.
03 is open at a non-facing position of approximately 90 degrees.

Reference numeral 111 denotes a plug inlet / outlet provided in the valve casing 101. The plug inlet / outlet 111 is opened at a position facing the inlet 102 and is formed to have a diameter through which the seat ring 105 and the ball plug 107 can enter and exit. .

[0004] A seat ring 105 is inserted into the valve casing 101 from the plug inlet / outlet 111 to the inlet 102 side so as to be detachably attached, and a ball plug 107 is mounted on the seat ring 105. The ball plug 107 is provided with a square hole-shaped shaft fitting hole 107a.
09 is detachably fitted and connected.

Reference numeral 108 denotes a valve hole provided in the ball plug 107. The valve hole 108 has an inlet 102 and an outlet 1
03 is bent at an angle of about 90 degrees so as to allow communication with the third part. 108a is a primary opening of the valve hole 108, 1
08b is a secondary opening of the valve hole 108.

The ball plug 107 has a valve opening 108 in which all of the primary opening 108a communicates with the inflow port 102, and
The valve is fully opened at a position where the secondary opening 108b communicates with the outlet 103, and a part of the primary opening 108a communicates with the inlet 102.
The rotation of the valve is controlled to a throttle position where the fluid flows out to the valve 03 and a valve fully closed position where the space between the inflow port 102 and the outflow port 103 is completely shut off.

Reference numeral 112 denotes an opening / closing lid which is detachably screwed to the plug entrance 111. A seat ring 106 is detachably fitted to the inner end of the opening / closing lid 112, and the seat ring 106 is a ball plug. It is in contact with 107. Reference numeral 113 denotes an actuator in which the valve shaft 109 is linked, and the rotation of the ball plug 107 is controlled by the actuator 113.

Next, the operation will be described. The ball valve configured as described above is provided with a primary pipe connected to the inlet 102 of the valve casing 101 and a secondary pipe connected to the outlet 103, and is used for use. Valve fully open position, throttle position,
Alternatively, the rotation of the ball plug 107 is controlled to the valve fully closed position.

[0009]

The conventional ball valve is constructed as described above.
When the fluid differential pressure is large or the port diameter is large between the side and the outlet 103 side, the force with which the ball plug 107 is pressed against the seat ring 106 increases. In order to obtain it, a large output operation device is required, and there is a problem that the cost is increased. In addition, the pressure applied to the seat ring 106 is also increased, which causes deformation and accelerates deterioration.

The present invention has been made to solve the above-described problems. For example, even when the fluid differential pressure and the bore are large, the ball plug 7 can be reliably and smoothly connected without increasing the opening / closing operation torque. The aim is to obtain a ball valve that can be operated.

[0011]

A ball valve according to the present invention comprises a valve casing forming a primary flow path and a secondary flow path, and a ball plug provided in the valve casing via a seat ring. A ball valve having means for rotating the ball plug, wherein the ball plug has a valve hole that allows the primary side flow path and the secondary side flow path to communicate with each other at a non-facing position, A space that is not communicated with the secondary flow path is formed on the opposite side of the primary flow path of the ball plug, and a means for guiding and introducing the fluid of the primary flow path into the space is provided. is there.

In the ball valve according to the present invention, the introduction portion comprises an external introduction pipe branched from the primary flow path.

[0013] In the ball valve according to the present invention, the introduction portion is formed by a conduction path formed inside the valve casing itself.

In the ball valve according to the present invention, the introduction portion is formed of a conduction path formed through the ball plug.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a longitudinal sectional view showing a configuration of a ball valve according to Embodiment 1 of the present invention. In the figure,
Reference numeral 1 denotes an integrated valve casing having a primary connection port and a secondary connection port. The primary connection port 1a and the secondary connection port 1b of the valve casing 1 are open at opposite positions.

Reference numeral 2 denotes a ball plug having a valve hole 21 which is bent at an angle of about 90 degrees and has a circular cross section so that the primary flow path and the secondary flow path can communicate with each other. The valve shaft 3 is detachably fitted and connected to the square hole-shaped shaft fitting hole 22 at a position facing the secondary flow path.

In the ball plug 2, the entirety of the primary side opening 21a of the valve hole 21 communicates with the primary side flow path, and the secondary side opening 21b communicates with the secondary side flow path. It reciprocates between a fully open position for maximally communicating the secondary flow path and a fully closed position for complete shutoff.

Reference numeral 4 denotes an opening / closing portion which is detachably screwed to a position facing the primary side flow path of the valve casing 1 and which opens and closes when replacing a ball plug 2 or the like in the valve casing 1; And a tubular opening / closing section main body 41 having therein a fluid introduction space (valve internal space) H1 for branching and introducing a fluid. In addition, a gasket P1 is interposed between the opening / closing section main body 41 and the valve casing 1.

Reference numerals 5 and 6 denote seat rings formed of a soft material such as synthetic resin, synthetic rubber, Teflon, graphite, etc., for contacting the ball plug 2 from both sides to hold the ball plug 2 in a predetermined position. The seat ring 5 is mounted in the fitting groove 1h on the primary flow path side of the valve casing 1 and abuts on the ball plug 2 from the primary flow path side, and the seat ring 6 is provided at the inner end of the opening / closing section main body 41. And is in contact with the ball plug 2 from the side facing the primary flow path.

Reference numeral 7 denotes an external introduction pipe (introduction section) for branching from the end of the primary pipe 8 to guide and introduce the fluid into the fluid introduction space H1. The external introduction pipe 7 is provided on the primary pipe 8 side. At the end, it is detachably attached to the primary pipe 8 by an attachment member M1, and is attached to the opening / closing section main body 41 by an attachment member M2 at the end on the opening / closing section 4 side. Reference numeral 9 denotes an actuator in which the valve shaft 3 is interlocked.
Thus, the rotation of the ball plug 2 is controlled.

Next, the operation will be described. First, the operation in the case of flowing from the primary pipe to the secondary pipe will be described. The ball valve configured as described above is provided in the valve casing 1.
A primary pipe 8 is connected to the primary connection port, and a secondary pipe (not shown) is connected to the secondary connection port for use. The actuator 9 opens the valve in the fully open position, the throttle position, Alternatively, the rotation of the ball plug 2 is controlled to the valve fully closed position, and the flow rate of the fluid flowing out from the primary connection port is adjusted.

A part of the fluid flowing from the primary pipe 8 toward the valve branches off from a through hole 8 a provided in the pipe wall at the end of the primary pipe 8, It is guided and guided to the fluid introduction space H1.

Therefore, the ball plug 2 receives the pressing force in the direction pressed against the seat ring 6 by the fluid coming from the primary flow path side, and at the same time, by the fluid injected into the fluid introduction space H1 from the opposite side. Also receives a pressing force in the direction pressed against the seat ring 5, and the pressing forces from both sides are substantially equal. by this,
Irrespective of the opening degree of the valve, the pressing force of the fluid pressing the ball plug 2 against the seat ring 6 in the direction of the arrow S1 is offset.

Next, a description will be given of an operation in the case of flowing from the secondary pipe to the primary pipe, contrary to the above. In a setting where the fluid flows from the secondary flow path to the primary flow path, for example, when fully closed, the secondary pressure is higher than the primary pressure, so the ball plug is pushed toward the primary flow path. However, the facing surface of the primary flow path is also at the same pressure by the introduction pipe, and the ball plug is also pushed in the opposite direction to the primary flow path. When the same force is applied in the opposite direction, they cancel each other. This prevents the ball plug from being pressed against one of the seat rings, thereby not only preventing the seat ring from being worn out, but also reducing the torque of the turning operation.

As described above, according to the first embodiment, since a part of the fluid on the primary side is branched, guided by the external introduction pipe 7 and guided to the fluid introduction space H1, the primary side fluid is formed. The pressure difference between the flow path and the space H1 facing the primary side flow path becomes almost zero, and the ball plug 2 is not pressed against one seat ring. Even when the fluid differential pressure or the diameter is large, the effect that the ball plug 2 can be reliably and smoothly operated without increasing the opening / closing operation torque is obtained. In addition, the effect of preventing deterioration due to early deformation of the seat ring and facilitating maintenance management can be obtained.

Embodiment 2 FIG. FIG. 2 is a cross-sectional view showing a configuration of a main part of a ball valve according to Embodiment 2 of the present invention. The second embodiment of the present invention is significantly different from the first embodiment in that, when a fluid is introduced into the fluid introduction space from the primary side, instead of the external introduction pipe 7, the valve casing 1 and the opening / closing portion 4 are used. The configuration is such that the provided introduction holes and the like are used. Except for this, the configuration is substantially the same as that of the first embodiment, so that the description will be simplified.

In FIG. 2, 1A is a valve casing, 2 is a ball plug having a valve hole 21, 4A is an opening / closing section, and 5, 6
Is a seat ring, H2 is a fluid introduction space (space in the valve)
It is. 1p and 1q are introduction holes (conduction paths, introduction portions) for guiding fluid from a primary side provided inside the valve casing 1A itself, and 4p are fluid guides from a primary side provided on the opening / closing portion 4A. (K) are provided between the valve casing 1A and the opening / closing part 4A, and are gaps (conductive paths, introduction parts) communicating with the introduction holes 1p, 4p. Note that a gasket P3 is interposed at the contact point between the opening / closing portion 4A and the valve casing 1A.

Next, the operation will be described. As shown in FIG. 2, the fluid flowing from the primary connection port side is partially branched, guided by the introduction holes 1p, 1q, 4p and the gap K, and guided to the fluid introduction space H2. The following operation is substantially the same as that described in the first embodiment, and a description thereof will not be repeated.

As described above, according to the second embodiment, the same effects as those described in the first embodiment can be obtained. In addition, the valve casing 1A is machined in advance and the introduction holes 1p, 1
Since q and the like are provided, it is possible to obtain an effect that the work can be performed easily and quickly, for example, at the time of assembling or replacing the ball plug.

Embodiment 3 FIG. 3 is a longitudinal sectional view showing the structure of a ball valve according to Embodiment 3 of the present invention, and FIG. 4 is a transverse sectional view showing the structure of a main part of the ball valve.
FIG. 5 is a cross-sectional view showing a configuration of a main part of the ball valve, in which the valve is fully opened, FIG. 5 is a cross-sectional view showing a state in which the valve is throttled, and FIG. FIG. 2 is a cross-sectional view showing a configuration of a main part, and is a cross-sectional view showing a state in which the valve is fully closed.

The third embodiment of the present invention is greatly different from the first embodiment in that a ball plug is provided instead of the external introduction pipe 7 when introducing a fluid into the fluid introduction space from the primary side. The point is that a through hole is used. Except for this, the configuration is substantially the same as that of the first embodiment, so that the description will be simplified.

3 to 6, 1A is a valve casing, 2A is a ball plug having a valve hole 21, 3 is a valve shaft,
4B is an opening / closing unit, 5 and 6 are seat rings, and H3 is a fluid introduction space (space in a valve). Reference numerals 2p and 2q denote through holes (conduction paths, introduction portions) for guiding fluid from the primary side provided in the ball plug 2A itself to the fluid introduction space H3. Note that a gasket P4 is interposed at a contact point between the opening / closing portion 4B and the valve casing 1A. Also,
In the third embodiment, it is assumed that the through holes 2p and 2q do not communicate with each other.

Next, the operation will be described. First, when the rotation of the ball plug 2A is controlled to the fully open position, as shown in FIGS. 3 and 4, a part of the fluid flowing from the primary connection port side branches off and is guided by the through hole 2p. And is led to the fluid introduction space H3. When the rotation of the ball plug 2A is controlled to the throttle position, as shown in FIG. 5, the fluid flowing from the primary connection port side is partially branched and guided by the through holes 2p and 2q. It is led to the fluid introduction space H3. Further, when the rotation of the ball plug 2A is controlled to the valve fully closed position, as shown in FIG. 6, the fluid flowing from the primary connection port side is partially branched and guided by the through hole 2q, It is led to the fluid introduction space H3. Thus, regardless of the opening degree of the valve, the pressing force of the fluid pressing the ball plug 2A against the seat ring 6 in the direction of the arrow S1 is canceled.

As described above, according to the third embodiment, the same effects as those described in the first embodiment can be obtained.
In addition, the ball plug 2A is processed in advance to form the through holes 2p,
Since the configuration is such that 2q or the like is provided, it is possible to obtain an effect that the operation can be performed easily and quickly, for example, at the time of assembling or replacing the ball plug. In addition, since the fluid can be guided from the primary side to the fluid introduction space H3 in a short distance, the effect of minimizing the location where a packing member such as a gasket is provided can be obtained.

Embodiment 4 FIG. FIG. 7 is a longitudinal sectional view showing a configuration of a ball valve according to Embodiment 4 of the present invention.
The fourth embodiment of the present invention is significantly different from the third embodiment in that a mechanism for adjusting the pressing force for pressing the seat ring 6 against the ball plug is provided.
Except for this, the configuration is substantially the same as that of the third embodiment, so that the description will be simplified.

In the figure, 1B is a valve casing,
A cylindrical wall 11 is provided on the side opposite to the primary connection port. Reference numeral 4C denotes an opening / closing portion, 43 denotes a movable member that is slidably fitted in the cylindrical wall portion 11 and abuts on the seat ring 6, and 44 denotes an opening facing the primary connection port of the valve casing 1B. A cover part 45 for closing is attached to the cover part 44, a tightening screw for pressing the movable member 43, and H4 is a fluid introduction space (space in the valve). Here, an O-ring P5 is fitted in a position where the movable member 43 of the cylindrical wall portion 11 slides, and an air vent hole 44a is provided in the lid portion 44.

Next, the operation will be described. First, the seat ring 6 is fastened by the fastening screw 45 via the movable member 43.
Is adjusted to press the ball against the ball plug 2A. When the rotation of the ball plug 2A is controlled to the valve fully open position, as shown in FIG. 7, a part of the fluid flowing from the inflow port 1a is branched and guided by the through hole 2p, and the fluid introduction space H4 It is led to. Similarly, when the rotation is controlled to the throttle position and the valve fully closed position, the fluid is guided to the fluid introduction space H4 and the ball plug 2A is connected to the seat ring 6A.
The pressing force of the fluid pressing in the direction of arrow S1 is canceled.

As described above, according to the fourth embodiment, the same effects as described in the third embodiment can be obtained. In addition, since the pressing force for pressing the seat ring 6 against the ball plug 2A can be adjusted by the tightening screw 45, for example, an appropriate pressing force depending on the degree of wear or deterioration of the seat rings 5 and 6 can be adjusted. Is obtained.

Embodiment 5 FIG. 8 is a longitudinal sectional view showing a configuration of a ball valve according to Embodiment 5 of the present invention.
The fifth embodiment of the present invention is significantly different from the fourth embodiment in that the seat ring 6 is configured to be pressed against a ball plug via an elastic member.
Except for this, the configuration is substantially the same as that of the fourth embodiment, so that the description will be simplified.

In the figure, 1C is a valve casing,
A cylindrical wall 11 is provided on the side opposite to the primary connection port. 4D is an opening / closing portion, 43 is a movable member, 44 is a lid portion, 45 is a tightening screw, 46 is a pressing member slidably fitted in the cylindrical wall portion 11 and pressed by the tightening screw 45, 47 is an elastic member interposed between the movable member 43 and the pressing member 46, and H5 is a fluid introduction space (space in the valve).

Here, an O-ring P6 is fitted into a portion of the cylindrical wall portion 11 where the movable member 43 slides, and a gasket P7 is provided in a contact portion between the valve casing 1C and the lid portion 44.
Is interposed. Further, an O-ring P8 is fitted into a predetermined portion of the lid 44 where the tightening screw 45 is attached. Further, the movable member 43 and the holding member 46 are respectively provided with conduction holes 43 for introducing a fluid from the primary side.
a, 46a are provided.

Next, the operation will be described. First, the pressing force of the pressing member 46 is adjusted by the tightening screw 45,
The pressing force for pressing the seat ring 6 against the ball plug 2A is adjusted by adjusting the elastic force of the elastic member 47.

For example, when the rotation of the ball plug 2A is controlled to the valve fully open position, as shown in FIG.
p, through the conduction holes 43a, 46a,
It is led to the fluid introduction space H5. Similarly, when the rotation is controlled to the throttle position and the valve fully closed position, the fluid is guided to the fluid introduction space H5, and the pressing force of the fluid pressing the ball plug 2A against the seat ring 6 in the direction of arrow S1 is canceled. . The conduction holes 43a and 46a may not be provided.

As described above, according to the fifth embodiment, by adjusting the pressing force of the seat ring 6 against the ball plug 2A by the tightening screw 45 and the elastic member 47, the wear of the seat rings 5 and 6 can be improved. And a suitable pressing force can be maintained according to the degree of deterioration.

In each of the above embodiments, a case has been described in which the direction of the secondary flow path immediately adjacent to the ball plug is substantially the same as the direction of the valve shaft 3. For example, in the third embodiment,
As shown in FIG. 9 as a modification of the first embodiment, the present invention can be applied to a case where the valve casing 1D has a secondary side flow path that is substantially orthogonal to the direction of the valve shaft 3. Further, the directions of the arrows S1 and S2 may be reversed. Further, although the shape of the valve hole 21 is circular in cross section, other shapes having a predetermined flow rate characteristic may be used. In FIG. 1, the primary connection port and the secondary connection port are formed on a straight line. However, similar effects can be obtained by forming the primary connection port and the secondary connection port at an intersecting position (angle shape) of 90 degrees.

In the third to fifth embodiments, the through holes 2p and 2q are not communicated with each other. For example, they may be communicated at the center. In the fourth and fifth embodiments, the seat ring is pressed by using the tightening screw or the elastic member. However, for example, a piston may be used.

[0047]

As described above, according to the present invention, a portion of the fluid on the primary side is branched, guided by the introduction portion, and guided to the space inside the valve, so that the ball plug is connected to the seat ring. Offset the pressing force of the pressing fluid,
For example, even when the fluid differential pressure or the diameter is large, there is an effect that the ball plug can be operated reliably and smoothly without increasing the opening / closing operation torque. In addition, there is an effect that deterioration due to early deformation of the seat ring can be prevented and maintenance management can be facilitated.

According to the present invention, a part of the fluid on the primary side is branched, guided by the external introduction pipe and guided to the space in the valve. Therefore, the pressing force of the fluid for pressing the ball plug against the seat ring is reduced. There is an effect that the ball plug can be operated reliably and smoothly without increasing the opening / closing operation torque even when the fluid pressure difference or the bore diameter is large, for example.

According to the present invention, since a part of the fluid on the primary side is branched, guided by the conduction path in the valve casing and guided to the space in the valve, the fluid which presses the ball plug against the seat ring is used. Offset the pressing force,
For example, even when the fluid differential pressure or the diameter is large, there is an effect that the ball plug can be operated reliably and smoothly without increasing the opening / closing operation torque.

Further, since the valve casing is preliminarily machined to provide the conduction path, there is an effect that the work can be performed easily and quickly, for example, at the time of assembling or replacing the ball plug.

According to the present invention, since a part of the fluid on the primary side is branched, guided by the conduction path in the ball plug and guided to the space in the valve, the pressing force for pressing the ball plug against the seat ring is provided. For example, even if the fluid differential pressure or the bore is large, there is an effect that the ball plug can be operated reliably and smoothly without increasing the opening / closing operation torque.

Further, since the ball plugs are formed in advance and the conduction paths are provided, it is possible to obtain an effect that the operation can be performed easily and quickly, for example, at the time of assembling or replacing the ball plugs. . In addition, since the fluid can be guided from the primary flow path to the space in the valve at a short distance, the location where the packing member such as a gasket is provided can be minimized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a ball valve according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a main part of a ball valve according to Embodiment 2 of the present invention.

FIG. 3 is a longitudinal sectional view showing a configuration of a ball valve according to Embodiment 3 of the present invention.

FIG. 4 is a cross-sectional view showing a configuration of a main part of a ball valve according to Embodiment 3 of the present invention, and is a cross-sectional view showing a state where the valve is fully opened.

FIG. 5 is a cross-sectional view showing a configuration of a main part of a ball valve according to Embodiment 3 of the present invention, and is a cross-sectional view showing a state where the valve is throttled.

FIG. 6 is a cross-sectional view showing a configuration of a main part of a ball valve according to Embodiment 3 of the present invention, and is a cross-sectional view showing a state where the valve is fully closed.

FIG. 7 is a longitudinal sectional view showing a configuration of a ball valve according to Embodiment 4 of the present invention.

FIG. 8 is a longitudinal sectional view showing a configuration of a ball valve according to Embodiment 5 of the present invention.

FIG. 9 is a cross-sectional view showing a configuration of a main part of a ball valve according to a modified example of Embodiment 3 of the present invention.

FIG. 10 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 1, 1A-1D Valve casing 1p, 1q, 4p Introducing hole (conduction path, introduction part) 2, 2A Ball plug 2p, 2q Through hole (conduction path, introduction part) 5, 6 Seat ring 7 External introduction pipe (introduction part) ) H1 to H5 Fluid introduction space (space in valve) K gap (conduction path, introduction part)

Claims (4)

[Claims] 1. A valve casing forming a primary flow path and a secondary flow path, a ball plug provided in the valve casing via a seat ring, and means for rotating the ball plug. A ball valve, wherein the ball plug has a valve hole that allows the primary side flow path and the secondary side flow path to communicate with each other at a non-facing position, and the ball plug has a valve hole facing the primary side flow path. A ball valve, wherein a space not communicating with the secondary flow path is formed, and a means for guiding and introducing the fluid in the primary flow path into the space is provided. 2. The ball valve according to claim 1, wherein the introduction section comprises an external introduction pipe branched from the primary flow path. 3. The ball valve according to claim 1, wherein the introduction portion comprises a conductive path formed inside the valve casing itself. 4. The ball valve according to claim 1, wherein the introduction portion comprises a conductive path formed through the ball plug.